> ## Documentation Index
> Fetch the complete documentation index at: https://docs.semgrep.dev/llms.txt
> Use this file to discover all available pages before exploring further.
# Troubleshoot ValueError: Invalid header value error
When scanning with Semgrep, you may run into the following error:
```bash expandable theme={null}
Invalid header value b'Bearer *******************************************************'
Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/semgrep/commands/wrapper.py", line 35, in wrapper
func(*args, **kwargs)
File "/usr/local/lib/python3.11/site-packages/semgrep/commands/ci.py", line 242, in ci
deployment_name = auth.get_deployment_from_token(token)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/semgrep/app/auth.py", line 17, in get_deployment_from_token
r = state.app_session.get(
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/requests/sessions.py", line 602, in get
return self.request("GET", url, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/semgrep/app/session.py", line 188, in request
response = super().request(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
resp = self.send(prep, **send_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
r = adapter.send(request, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/requests/adapters.py", line 486, in send
resp = conn.urlopen(
^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/urllib3/connectionpool.py", line 714, in urlopen
httplib_response = self._make_request(
^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/urllib3/connectionpool.py", line 415, in _make_request
conn.request(method, url, **httplib_request_kw)
File "/usr/local/lib/python3.11/site-packages/urllib3/connection.py", line 244, in request
super(HTTPConnection, self).request(method, url, body=body, headers=headers)
File "/usr/local/lib/python3.11/http/client.py", line 1283, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/local/lib/python3.11/http/client.py", line 1324, in _send_request
self.putheader(hdr, value)
File "/usr/local/lib/python3.11/site-packages/urllib3/connection.py", line 224, in putheader
_HTTPConnection.putheader(self, header, *values)
File "/usr/local/lib/python3.11/http/client.py", line 1261, in putheader
raise ValueError('Invalid header value %r' % (values[i],))
ValueError: Invalid header value b'Bearer *******************************************************'
```
This error indicates that there is a problem in the pasted `SEMGREP_APP_TOKEN` value, most often an extra newline (`\n`).
## Fix a secret on GitHub
To fix on GitHub:
At either the organization or repository level, go to **Settings** > **Secrets and variables**
Update the value of the `SEMGREP_APP_TOKEN` to ensure it does not have an extraneous newline (`\n`) and is not malformed
## Fix a secret on GitLab
To fix on GitLab:
Go to your repository's **CI/CD** settings
Update the `SEMGREP_APP_TOKEN` value to ensure it does not have an extraneous newline (`\n`) and is not malformed
